towerman
My status is now now widower
Posts: 2,886
|
Post by towerman on Feb 21, 2009 20:32:10 GMT
Is there any reason why all the double ended units appear to be coupled together?Is it something to do wth the upgrade?
|
|
|
|
Post by astock5000 on Feb 23, 2009 23:12:27 GMT
I noticed that last week. I don't know what it would have to do with the upgrade.
|
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,400
|
Post by metman on Feb 24, 2009 9:11:54 GMT
It rarely happens on the Met/Dist! Can't think of any reason really, maybe it looks nice?  |
|
Ben
fotopic... whats that?
Posts: 4,282 
|
Post by Ben on Feb 24, 2009 12:38:58 GMT
Hehe. Its interesting you say that; out of the three times Ive been back to london in the past...6 months (maybe) Ive seen on the Met 4 trains of just double enders.
Now that the ELL is closed the probability of it happening must have increased a bit.
|
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,400
|
Post by metman on Feb 24, 2009 17:45:29 GMT
Saw a pair of double enders coming out of Neasden a short while ago! |
|
|
|
Post by astock5000 on Feb 24, 2009 21:46:50 GMT
It rarely happens on the Met/Dist! You hardly ever see two double ended D stock units running together on the District, as double ended units are longer than single ended ones. |
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,400
|
Post by metman on Feb 24, 2009 23:48:00 GMT
...but not much longer. Same for the Picc.
|
|
|
|
Post by astock5000 on Feb 25, 2009 22:11:00 GMT
'London Underground Rolling Stock' says all 73TS cars are the same length (17475mm).
|
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,400
|
Post by metman on Feb 25, 2009 23:37:06 GMT
|
|
|
|
Post by astock5000 on Feb 25, 2009 23:43:16 GMT
If 73TS DMs are shorter, then a train with two double ended units is shorter, so why is it that you hardly ever see two double ended units running together on the Picc. There is a reason why it doesn't often happen on the District, but if it has nothing to do with the length of the train, why doesn't it happen on the Picc?
|
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,400
|
Post by metman on Feb 26, 2009 0:04:17 GMT
At a guess, fewer door options and a huge gap in the middle of the train. Many of the exits are in the middle of the Yerkes stations? Any Picc t/ops out there?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 26, 2009 4:01:34 GMT
If 73TS DMs are shorter, then a train with two double ended units is shorter, so why is it that you hardly ever see two double ended units running together on the Picc. There is a reason why it doesn't often happen on the District, but if it has nothing to do with the length of the train, why doesn't it happen on the Picc? I was under the impression that a 6-car train of double-ended D stocks would not fit within the CSDE loop at Gloucester Road e/b with all passenger doors within the platform. If such a train berthed in the correct spot, ISTR that the last two doors of the rear DM would need to be cut out. Are there also issues with replacing blockjoints and track circuit down/up ordering when double ended D stocks stop in certain locations? I remember BAET and DistrictSOM mentioning stuff like that in the past... |
|
Colin
Advisor
My preserved fire engine!
Posts: 11,310
|
Post by Colin on Feb 26, 2009 4:38:52 GMT
I was under the impression that a 6-car train of double-ended D stocks would not fit within the CSDE loop at Gloucester Road e/b with all passenger doors within the platform. Slight correction - the CSDE (correct side door enable) loop is only critical in so far as the position of the leading cab is concerned. Did you mean Westbound BTW? ;D ;D If such a train berthed in the correct spot, ISTR that the last two doors of the rear DM would need to be cut out. In terms of a train made up of two double enders, I can't say I've ever seen any instruction which specifically demands that; that being said, most drivers ought to be aware that the train would be slightly longer than normal with two cabs in the middle - but is the difference actually that great?  Are there also issues with replacing blockjoints and track circuit down/up ordering when double ended D stocks stop in certain locations? I remember BAET and DistrictSOM mentioning stuff like that in the past... Now that would be a new one on me! |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 27, 2009 0:55:16 GMT
I was under the impression that a 6-car train of double-ended D stocks would not fit within the CSDE loop at Gloucester Road e/b with all passenger doors within the platform. Slight correction - the CSDE (correct side door enable) loop is only critical in so far as the position of the leading cab is concerned. Did you mean Westbound BTW? ;D ;D I think so! I always thought the eastbound was narrow in the wrong location compared to the westbound, but ISTR now that the westbound is indeed much tighter. In terms of a train made up of two double enders, I can't say I've ever seen any instruction which specifically demands that; that being said, most drivers ought to be aware that the train would be slightly longer than normal with two cabs in the middle - but is the difference actually that great? Someone calculated it once from Glover's title "London Underground Rolling Stock", and the difference was actually quite noticeable. Tubeprune probably has the necessary dimensions on his website somewhere. Are there also issues with replacing blockjoints and track circuit down/up ordering when double ended D stocks stop in certain locations? I remember BAET and DistrictSOM mentioning stuff like that in the past... Now that would be a new one on me! Considering how badly I misremembered the short platform at Gloucester Road, this may be a misrememberance as well  |
|
|
|
Post by tubeprune on Feb 27, 2009 7:03:31 GMT
|
|
|
|
Post by Dstock7080 on Feb 27, 2009 11:55:09 GMT
Someone calculated it once from Glover's title "London Underground Rolling Stock", and the difference was actually quite noticeable. Tubeprune probably has the necessary dimensions on his website somewhere. I did post this calculation for D Stock somewhere else on this forum, when we had a similar discussion about D Stock double-enders. DM . . . T . . . DM . . + DM . . . T . . . DM 18372-18119-18372+18372-18119-18372 = 109726 18372-18119-18119+18119-18119-18372 = 109220 DM . . . T . . . UNDM + UNDM . T . . . DM A difference of 506mm or 19.92 inches. Quite a difference, think of the width of the 'O' or 'N' door window- then its new position at the rear of a train in say . . High Street pfm3- with the train on the correct EB stopping mark. |
|
Ben
fotopic... whats that?
Posts: 4,282
|
Post by Ben on Feb 27, 2009 14:10:44 GMT
I'm suprised that Gloucester Road has short platforms; I thought they were lengthened to 410' upon track simplification in the 60s; at least I think thats what Follantfant wrote in 'Reconstructing Londons Underground'
|
|
